The ratio of Ian's age to Paul's age is 5 : 3. Last year, their average age was 23. How old will Paul be in 4 years' time?
| |
Ian |
Paul |
Total |
| Before |
5 u - 1 |
3 u - 1 |
46 |
| Change |
+ 1 |
+ 1 |
|
| After |
5 u |
3 u |
48 |
Total age of Ian and Paul this year
= 5 u + 3 u
= 8 u
Total age of Ian and Paul this year
= 2 x 23 + 1 + 1
= 46 + 2
= 48
8 u = 48
1 u = 48 ÷ 8 = 6
Paul's age in 4 years' time
= 3 u + 4
= 3 x 6 + 4
= 18 + 4
= 22
Answer(s): 22
